netdev - Re: [PATCH net 0/3] net/sched Bind logic fixes for cls_fw, cls_u32 and cls

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Date: Fri, 21 Jul 2023 16:00:29 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: valis <sec@...is.email>, netdev@...r.kernel.org
Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, victor@...atatu.com, ramdhan@...rlabs.sg,
 billy@...rlabs.sg
Subject: Re: [PATCH net 0/3] net/sched Bind logic fixes for cls_fw, cls_u32
 and cls_route

On 21/07/2023 14:48, valis wrote:
> Three classifiers (cls_fw, cls_u32 and cls_route) always copy
> tcf_result struct into the new instance of the filter on update.
> 
> This causes a problem when updating a filter bound to a class,
> as tcf_unbind_filter() is always called on the old instance in the
> success path, decreasing filter_cnt of the still referenced class
> and allowing it to be deleted, leading to a use-after-free.
> 
> This patch set fixes this issue in all affected classifiers by no longer
> copying the tcf_result struct from the old filter.
> 
> valis (3):
>    net/sched: cls_u32: No longer copy tcf_result on update to avoid
>      use-after-free
>    net/sched: cls_fw: No longer copy tcf_result on update to avoid
>      use-after-free
>    net/sched: cls_route: No longer copy tcf_result on update to avoid
>      use-after-free
> 
>   net/sched/cls_fw.c    | 1 -
>   net/sched/cls_route.c | 1 -
>   net/sched/cls_u32.c   | 1 -
>   3 files changed, 3 deletions(-)
> 

For the series,

Reviewed-by: Pedro Tammela <pctammela@...atatu.com>
Tested-by: Pedro Tammela <pctammela@...atatu.com>